class_docstr: DistributedImageSet wraps an RDD of ImageFeature
docstr: get prediction rdd from ImageSet
docstr_tok: ["get","prediction","rdd","from","ImageSet"]
code: def get_predict(self, key="predict"):
      """
      get prediction rdd from ImageSet
      """
      predicts = callZooFunc(
          self.bigdl_type,
          "distributedImageSetToPredict",
          self.value,
          key,
      )
      return predicts.map(
          lambda predict: (
              predict[0],
              list(map(lambda x: x.to_ndarray(), predict[1])),
          )
          if predict[1]
          else (predict[0], None)
      )
  
imports: from bigdl.transform.vision.image import ImageFrame
  from bigdl.util.common import *
  from zoo.common.utils import callZooFunc
label_desc: Use image node_id 4 for calling the DistributedImageSet obj's underlying member method code with example usage: obj.get_predict(key) and returns: predicts